sfmtcvt: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/sfmtcvt - from package: simh

You may install the required package with command apt-get install {package}

Error in other languages:
sfmtcvt: bevel nie gevind nie
sfmtcvt: comandă negăsită
sfmtcvt: comando não encontrado
sfmtcvt: commande introuvable
sfmtcvt: command not found
sfmtcvt: käsku ei ole
sfmtcvt: không tìm thấy lệnh
sfmtcvt: komanda nerasta
sfmtcvt: Kommando nicht gefunden.
sfmtcvt: kommandot finns inte
sfmtcvt: komut yok
sfmtcvt: nie znaleziono polecenia
sfmtcvt: níor aimsíodh an t-ordú
sfmtcvt: no se encontró la orden
sfmtcvt: no s'ha trobat l'ordre
sfmtcvt: opdracht niet gevonden
sfmtcvt: parancs nem található
sfmtcvt: perintah tidak ditemukan
sfmtcvt: príkaz nenájdený
sfmtcvt: příkaz nenalezen
sfmtcvt: команда не найдена
sfmtcvt: командата не е открита
sfmtcvt: 命令找不到
sfmtcvt: コマンドが見つかりません